Fixes#17932
No more ""infection holder" bursts out of" memes, as zombie infection is
now done with a body egg in the head.
- Added 'romerol' a silent bioweapon reagent that adds the zombie
infection organ to a living person. This will lie dormant until they
die. Then they will stand up again.
- Zombie infection uses body_egg, meaning it shows up on healthHUDs.
- Zombies are now a full subspecies of humans, instead of
simple_animals. However, they should still be mostly the same, still
unable to pick up items, still zombify on attack and still able to claw
open doors.
Side Effects
- Zombies now take time to destroy tables
- Zombies can have their limbs cut off and be reduced to wandering
around being a bit pathetic. This is a feature.
- Zombies can be stunned and are vulnerable to stamina damage and
chemicals
- Zombies are armoured, but instantly die in crit, meaning they have
approximately 120 hp as before
- Zombie hands are just bloody hands, a proper sprite maybe sometime
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